package com.smy.baseutil.serect;

import java.security.MessageDigest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
 * 
* @Title: MD5Util.java  
* @Description: Md5加解密
* @author zhoutao    
* @date 2018年1月17日 下午5:49:08  
* @version V1.0
 */
public class MD5Util {

	private static Logger logger = LoggerFactory.getLogger(MD5Util.class);

    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
        } catch (Exception e) {
        	logger.error("MD5加密出错", e);
        }
        return resultString;
    }
    
    public static String encode(String origin) {        
        return encode(origin, "UTF-8");
    }

    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
        "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
    

}
